Kickstart your portfolio with a U.S. stock on us
Sign up and fund a new Wall St account and get a full U.S. share.Sign up and fund a new Wall St account and get a full share randomly chosen between GoPro, Dropbox or Nike.T&Cs apply
Castle Biosciences Inc
About CSTL
Castle Biosciences, Inc. is a molecular diagnostics company offering test solutions to aid clinicians in the diagnosis and treatment of dermatologic cancers, Barrett’s esophagus (BE), uveal melanoma (UM), and in the treatment of mental health conditions. The Company offers around six commercially available proprietary multi-analyte assays with algorithmic analysis (MAAA) tests for use in the fields of dermatology, gastroenterology ophthalmology and includes a test to guide systemic treatment decisions in patients with moderate-to-severe AD. It also offers a proprietary pharmacogenomic (PGx) test to guide optimal drug treatment for patients diagnosed with depression, anxiety and other mental health conditions. Its products include DecisionDx-Melanoma, DecisionDx-SCC, MyPath Melanoma, TissueCypher, IDgenetix, and DecisionDx-UM. DecisionDx-SCC is its proprietary gene expression profile (GEP) test for patients with cutaneous squamous cell carcinoma (SCC).
Find out what a historical investment in Castle Biosciences Inc would be worth today using our CSTL stock calculator.
Market Capitalisation
$582.34M
Price-earnings ratio
-
Dividend yield
0.00%
Volume
425.11K
High today
$20.05
Low today
$18.91
Open price
$19.28
52-week high
$44.28
52-week low
$14.59
Ready to start your investing journey with Stake?
Open an accountHow do I buy CSTL shares in Australia?
Buying CSTL shares in Australia can be done through an online investing platform, such as Stake. Follow the simple steps below to start investing in Castle Biosciences Inc in minutes.
- Sign up with some I.D. and zero paperwork
- Add funds to your account
- Make your first investment in CSTL
What is the ticker symbol of Castle Biosciences Inc?
The ticker symbol for Castle Biosciences Inc is CSTL.
How much is one share of CSTL?
One share of CSTL is valued at $19.96 as of 21 May 2026.
What is the market capitalisation of Castle Biosciences Inc CSTL?
As of 21 May 2026 Castle Biosciences Inc has a market cap of $582.34M.
What is the 52-week high for Castle Biosciences Inc stock?
The Castle Biosciences Inc 52-week high stock price is $44.28.
What is the 52-week low for Castle Biosciences Inc stock?
The Castle Biosciences Inc 52-week low stock price is $14.59.
Can I buy CSTL shares through Stake, an investing platform like CommSec, Selfwealth or Superhero?
Yes, the Stake investing platform allows you to buy CSTL shares and over 12,000 more stocks and ETFs across the ASX and Wall St.
This is not financial product advice nor a recommendation to invest in the securities listed. Past performance is not a reliable indicator of future performance. As always, do your own research and consider seeking financial, legal and taxation advice before investing. No representation is made as to the timeliness, reliability, accuracy or completeness of the market data provided.
Invest in CSTL on Stake
- Buy CSTL from US$3 brokerage
- Invest in 9,500+ U.S. stocks and ETFs
- Own a slice of CSTL from only US$10 with fractional shares
Stock shown for demonstrative purposes only. US$3 brokerage up to US$30,000.
CSTL related stocks